Joint for paperboard sheets



June 25, 1957 J. WATERS 2,796,638

JOINT FOR PAPERBOARD SHEETS Filed Jan. 19-, 1955 2 Sheets-Sheet l E, V/%/ ////f INVENTOR JTLWQ 2e r5 ATTORNEY June 25, 1957 J- WATERS JOINT FOR PAPERBOARD SHEETS 2 Sheets-Sheet 2 Filed Jan. 19, 1955 INVENTOR JZLWQ 2e r5 x. W ATTORNEY United States atent JOINT FOR PAPERBOARD SHEETS Joseph L. Waters, Chicago, 111. Application January 19, 1955, Serial No. 482,853 10 Claims. (Cl. 20-15) This invention relates to a novel joint for interlocking sheets of paperboard of the type used in buildings to provide heat and cold insulation and to additionally form a decorative wall surface.

More particularly, it is an aim of the present invention to provide paperboard sheets with turned back folds along opposite edges thereof and which are disposed on opposite sides of the sheets to form means capable of being readily interlocked with similar folds of other sheets to facilitate assembly of the sheets with one another and to insure maintenance of the sheets in properly overlapping interlocked relation when secured to a supporting surface such as joists or furring strips.

Another object of the invention is to provide novelly constructed interlocking joints which are so constructed that the joint portions will be deformed into tight interlocking engagement by driven fastenings employed to secure the paperboard sheets to joists or furring strips.

Various other objects and advantages of the invention will hereinafter become more fully apparent from the following description of the drawings, illustrating presently preferred embodiments thereof, and wherein:

Figure 1 is a plan view showing a plurality of the insulating sheets assembled and secured to a supporting surface, certain of the sheets being broken away;

Figure 2 is an enlarged detailed transverse sectional view, taken substantially along a plane as indicated by the line 2-2 of Figure 1;

Figure 3 is an enlarged detailed longitudinal sectional view, taken substantially along a plane as indicated by the line 3-3 of Figure 1;

Figure 4 is an enlarged fragmentary sectional view, taken substantially along a plane as indicated by the line 4-4 of Figure 1;

Figure 5 is an enlarged fragmentary perspective view of a portion of one of the paperboard sheets including a portion of the joint thereof;

Figure 6 is a similar view edge portion of said sheet;

Figure 7 is a View similar to Figure {1 showing a modified form of the joint;

Figure 8 is a fragmentary exploded sectional view of adjacent edge portions of two paperboard sheets shown disconnected and having joint forming parts of the type as illustrated in Figure 7;

Figure 9 is a view similar form of joint;

Figure 10 is a View similar to Figure 7 showing the parts as illustrated in Figure 9 interlocked and compressed together, and

Figure 11 is a fragmentary sectional view showing a fourth form of joint with the joint forming parts interlocked but not compressed.

Referring more specifically to the drawings and first with reference to Figures 1 to 6, a plurality of corresponding pieces or sheets of heat and cold insulating paperboard are illustrated in Figure l and are each designated of the other joint forming to Figure 8 showing a third ice generally 12. The pieces or sheets 12, which preferably are provided on both sides thereof with laminations of aluminum foil, are herein disclosed as being of elongated rectangular shape. As best illustrated in Figures 4, 5 and 6, the pieces or sheets 12 have turned back end portions which, as seen in Figure 3, are disposed on opposite sides thereof. The piece or sheet 12 is stitched transversely as seen at 13 adjacent the bend 14 forming the fold 15 at each end thereof to maintain the folds 15 in overlying relation to portions of opposite sides of the two ends of the piece 12. Each fold 15 includes an unsecured fold portion 16 disposed beyond the stitching 13 and which is ofiset away from the main body of the piece 12 and which is substantially wider than the fold portion disposed between the folded edge 14 and the stitching 13. The pieces or sheets 12 may be of various lengths and widths, preferably of a width'to permit their longitudinal side edge portions to substantially overlie adjacently disposed parallel anchoring strips 17, which are illustrated in Figures 1 to 4 in the form of fun-ing strips secured to a wall surface 18 but which could constitute joists disposed between a roof and a ceiling. The paper board insulating pieces or strips 12 are applied in courses lengthwise of the furring strips 17 and the ends of adjacent pieces 12 of each course are connected by interlocking the unsecured fold portions 16, as best illustrated in Figures 3 and 4. The longitudinal edge portions of the pieces 12 of adjacent courses are disposed in over lappingrelation to one anothergas seen in Figure 2, and said overlapping longitudinal edge portions are secured to the members 17 by suitably driven fastenings, preferably staples 19 which may be applied with a stapling machine through the overlapping portions of the pieces 12 and anchored in the members 17. Certain of the fastenings 19 extend through end portions of the interlocked joints 20, as seen in Figure 4, formed by the fold portions 16 to thus eflectively secure the joints 20 in interlocked relation. I It will thus be seen that the pieces 12 will provide an effective wall or ceiling. The assembled pieces 12 will provide an air chamber behind or above the wall or ceiling, respectively, formed thereby in combination with the members 17 to which said pieces 12 are secured. The air chamberthus formed, as seen in Figures 2 and 3, will provide heat and cold insulation in addition to the heat and cold insulating characteristics of the sheets 12. Additionally, the aluminum foil faces of the pieces 12 will provide reflective surfaces so that additional heat and cold insulation is thus provided by reflection. Further, a wall or ceiling formed by the assembled pieces 12 will be of attractive appearance. Figures 7 and 8 illustrate a slightlydiiferent form of joint. As best illustrated in Figure 8, the pieces 12a corresponding to the pieces 12 have turned back ends disposedon opposite sides thereof and forming folds 15a which arestitched as seen at 13a adjacent the edges 14a of the folds, similar to the stitching 13. However, a strip 21 of a length corresponding to the length of the fold 15a and of a width slightly less than the width'of said'fold 15a-is interposed between the' foldjportion 15a andthe main body portion of the piece 12a with one longitudinal edge abutting or substantially abutting the inner side of the folded edge 14a. The stitching 13a extends through this intermediate ply or strip 21 for anchoring it in the sheet 12a between the main body part thereof and each of its folds 15a, each piece 12a being thus provided with two strip members 21. The unsecured part 16:: of the fold 15a, corresponding to the fold portion 16, is offset away from the unsecured part 22 of the insert strip 20 and which part 22 forms a tongue. Additionally, the main body of the piece 12a, inwardly stitching 13a, in a direction away from the folded edge with respect to the 14a, is likewise offset away from the tongue 22, as best illustrated in Figure 8.

The joint parts as illustrated in Figure 8 are shown interlocked in Figure 7 to form the joint 23 through which extends a fastening or staple 19, at each end of said interlocked joint, asillu'strated inFigure 1 in'connection'with the pieces 12 It will be' noted that each fold Portion 16a interfits between the tongue 22 and the main body of the other piece 12a. Thus, the two tongues 22 are disposed in partially overlapping contacting relation to one another and between the two fold portions 16a to thus provide an effective and secure interlocked joint.

Figure 9 illustrates a third form of joint and shows adjacent ends of two insulatingpieces 12b and 120 having turned back fold portions 15b and 15c, respectively, which are secured by stitching 13b and 13c, respectively, adjacent the folded edges 14b and14c, respectively. The unsecured portions 16b and 160 of the folds 15b and 15c, respectively; are offset way from the insulating pieces of which they form parts and are transversely bent and bowed into dissimilar shapes as clearly illustrated in Figure 9. After the fold portions 16b and 16c are interlocked with one another to form the joint 24, as seen in Figure 10, said portions 16band 160 are flattened by the compressive force of the staples or driven'fastenings 19 which extend through the ends of the joint 24. However, the portions 16b and 16c retain a slightly irregular shape to thus'more effectively retain said parts in interlocked relation, as illustrated in Figure 10.

Figure 11 illustrates still another modified form of joint, designated generally 25. The joint 25 differs from the joint 20, as illustrated in Figure 4, only in that the unsecured fold portions 16d of the two pieces 12d are of zigzag or undulating shape in cross section. Unlike the fold portions 16b and 160 of the joint 24, the fold portions 16d are of similar shape and are accordingly capable of close interfitting engagement, as illustrated, before the joint 25 is compressed by driven fastenings or staples 19. It will be readily apparent that when the joint 25 is compressed that the portions 16d will be flattened but will partially retain their zigzag shape to maintain a secure interlocking engagement with one another.

It will be understood that the sheets 12a, 12b, 12c and 12d are each provided with a joint section at each end thereof and that the joint sections of each piece or sheet are disposed on opposite sides of the main body of the sheet. f It will also be apparent that the pieces of insulating paperboard may be of other shapes than as'illustrated and the joint forming folds thereof maybe provided in longitudinal edges rather than in the end portions.

Various other modifications and changes are likewise contemplated and may obviously be'resorted to, without departing from the spirit or scope of the invention as hereinafter defined by the appended claims.

I claim as my invention: 7

1. A structure of the character described comprising a plurality of pieces of heat and cold insulating material having turned back opposite edge portions forming folds, said folds of each piece being disposed on opposite sides thereof, stitching connecting each fold portion to the main body of the piece adjacent the folded edge of said fold portion, each of said fold portions including a relatively wide unsecured portion disposed on the opposite side of the stitching, said unsecured fold portions of adjacent insulating pieces being interlocked in overlapping relation, and a plurality of fastenings securing the interlocked insulating pieces to a supporting surface, certain of said fastenings extending through portions of the interlocked joints formed by said interengaged unsecured fold portions.

2. A structure as in claim 1, and a strip disposed in each of said fold portions and secured thereto by stitching, said strips including unsecured portions forming tongues, and said tongues being disposed in overlapping relation to one another and between the unsecured fold portions of the joint.

3. A structure as in claim 1, said unsecured fold portions of the joint being transversely bent, said bent portions being caused to tightly interlock with one another by said fastenings which extend through the joint to partially deform the bent portions.

4. A structure as in claim 3, said unsecured fold portions being of similar shape for conformable interfitting engagement with one another.

5. A structure as in claim 1, said unsecured fold .por-' tions of the joint being transversely bent and being partially flattened when the joint is compressed by the fastenings for tightly interlocking the unsecured fold portions with one another, said unsecured fold portions being of dissimilar shape.

6. A sheet of heat and cold insulating paperboard having turned back opposite edges forming fold portions, stitching securing said fold portions adjacent the folded edges thereof to the sheet, each of said fold portions having a relatively wide unsecured part offset away from the sheet, said fold portions being adapted to overlap corresponding sheets for interlocking engagement of fold portions of adjacent sheets to provide interlocking joints for connecting a plurality of the sheets together.

7. A sheet as in claim .6, said fold portions of the sheet being disposed on opposite sides thereof at the ends. of the sheet.

8. A sheet as in claim 7, a strip of paperboard disposed between each fold portion and the adjacent portion of the sheet and having a longitudinal edge portion secured to the fold portion and sheet by stitching thereof, said strips having relatively wide unsecured portions disposed in partially overlapping abutting engagement with one.

another in the joint and between the. unsecured fold portions of the joint. i

9. A sheet as in claim 6, said unsecured fold portion being bent and creased transversely, and anchoring fastenings extending through the joints formed by the fold portions for partially flattening and securely interlocking the unsecured fold portions forming the joint.

10. A sheet as in claim 9, said unsecured fold portions being shaped to conformably interfit in interlocked relation to one another to form the joints between adjacent edge portions of adjacent strips.

References Cited in the file of this patent UNITED STATES PATENTS 

